Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thanh di » thanh doi, thanh de, thanh do
vu khanh » vu thanh, duy khanh, le khanh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
duc ban » duc tan, duc van, dua ban
bo sach » co sach, hoc sach
ve cao » va cao, ve bao, ve cac
di cau » da cau, diem cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) or (((vu khanh) or (van khanh)))) ky nang xa hoi. hieu ve cao duc ban thanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (((vu khanh) OR (van khanh)))) ky nang xa hoi. hieu ve cao duc ban thanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (((vu khanh) or (van khanh)))) ky nang xa hoi. hieu ve cao duc ban thanh di cau tren*.